feat(go): add nats kafka ingest bridge

go/vehicle-gateway/internal/eventbus/nats_sink_test.go

@@ -0,0 +1,55 @@
+package eventbus
+
+import (
+	"context"
+	"encoding/json"
+	"testing"
+
+	"lingniu-vehicle-ingest/go/vehicle-gateway/internal/envelope"
+)
+
+func TestNATSSinkRoutesRawAndUnifiedSubjects(t *testing.T) {
+	publisher := &recordingNATSPublisher{}
+	sink := newNATSSinkWithPublisher(publisher, NATSConfig{
+		RawSubjects: map[envelope.Protocol]string{
+			envelope.ProtocolJT808: "vehicle.raw.jt808.v1",
+		},
+		UnifiedSubject: "vehicle.event.unified.v1",
+	})
+	env := envelope.FrameEnvelope{Protocol: envelope.ProtocolJT808, Phone: "13307795425", MessageID: "0x0200"}
+
+	if err := sink.PublishRaw(context.Background(), env); err != nil {
+		t.Fatalf("PublishRaw() error = %v", err)
+	}
+	if err := sink.PublishUnified(context.Background(), env); err != nil {
+		t.Fatalf("PublishUnified() error = %v", err)
+	}
+
+	if got, want := publisher.messages[0].subject, "vehicle.raw.jt808.v1"; got != want {
+		t.Fatalf("raw subject = %q, want %q", got, want)
+	}
+	if got, want := publisher.messages[1].subject, "vehicle.event.unified.v1"; got != want {
+		t.Fatalf("unified subject = %q, want %q", got, want)
+	}
+	var decoded envelope.FrameEnvelope
+	if err := json.Unmarshal(publisher.messages[0].data, &decoded); err != nil {
+		t.Fatalf("raw payload is not envelope json: %v", err)
+	}
+	if decoded.Phone != "13307795425" {
+		t.Fatalf("decoded phone = %q", decoded.Phone)
+	}
+}
+
+type recordingNATSPublisher struct {
+	messages []recordedNATSMessage
+}
+
+type recordedNATSMessage struct {
+	subject string
+	data    []byte
+}
+
+func (p *recordingNATSPublisher) Publish(_ context.Context, subject string, data []byte, _ ...NATSPublishOption) error {
+	p.messages = append(p.messages, recordedNATSMessage{subject: subject, data: append([]byte(nil), data...)})
+	return nil
+}